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A Casting Process for Production of Twin-screw Extruder Barrel Bushings Using High Vanadium-Chromium Ferrochrome

A technology of twin-screw extrusion and high-vanadium ferrochrome, which is applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc., to achieve the effects of improving strength, avoiding cracking, and preventing severe collisions

Active Publication Date: 2019-11-08
马鞍山市华威冶金机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this patent is to overcome the shrinkage of the thick wall on the upper and lower surfaces of the barrel and the shrinkage and porosity at the junction of the liner and the inner gate in the casting process of the existing twin-screw extruder liner, and to provide a high vanadium chromium Casting process of barrel bushing of twin-screw extruder in iron production

Method used

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  • A Casting Process for Production of Twin-screw Extruder Barrel Bushings Using High Vanadium-Chromium Ferrochrome
  • A Casting Process for Production of Twin-screw Extruder Barrel Bushings Using High Vanadium-Chromium Ferrochrome
  • A Casting Process for Production of Twin-screw Extruder Barrel Bushings Using High Vanadium-Chromium Ferrochrome

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Such as figure 1 , figure 2 , Figure 5 , Figure 6 and Figure 7 As shown, a casting process for producing twin-screw extruder barrel liners with high vanadium ferrochrome in this embodiment includes the following process steps:

[0060] Step 1: Sand mixing, the performance of the sand is controlled at 4.5-5.5% moisture, air permeability 110-140, wet compressive strength 120-150kPa, compaction rate 38-42%;

[0061] Step 2: Make a mold, including foundry molding and box closing, forming an upper box with two ingates 6 and a heating riser 7 and a lower box with graphite cold iron 8, and the upper box and the lower box. Form a molding chamber 11 for producing the cylinder liner of a twin-screw extruder, and the upper box and the lower box are provided with a side-mounted pouring channel;

[0062] Step 3: pouring, including pouring with high-vanadium-chromium iron molten iron, the molten iron enters the molding cavity 11 of the cylinder liner of the twin-screw extrud...

Embodiment 2

[0069] Such as figure 1 , figure 2 , Figure 5 and Figure 6 As shown, a casting process of producing twin-screw extruder cylinder liners with high vanadium chromium ferrochrome in this embodiment, the specific process of said step 2:

[0070] (1) Foundry molding, molding a side-mounted pouring channel connected with the outer gate 1 in the upper box body and the lower box body, the side-mounted pouring channel includes sprue 2, sprue nest 3, and runner 4. Ordinary measuring riser 5 and ingate 6, the bottom of the sprue 2 is provided with a sprue nest 3; the upper part of the sprue nest 3 is connected with the horizontal runner 4; The ends of the runners 4 are respectively connected with common side risers 5; the two common side risers 5 are respectively connected with two ingates 6; the two ingates 6 communicate with the molding cavity 11;

[0071] (2) Close the box to form a complete box to be poured.

[0072] In this embodiment, when pouring, the high-vanadium-chromiu...

Embodiment 3

[0074] Such as figure 1 , figure 2 , Figure 5 and Figure 6 As shown, a casting process of producing a twin-screw extruder cylinder liner with high vanadium chromium ferrochrome in this embodiment, the specific steps of the foundry molding are as follows:

[0075] a. Spray release agent into the upper box molding machine, reserve the position of heating riser 7, then add green sand, and press it to make a funnel-shaped outer gate 1, which communicates with the side-mounted pouring channel ;

[0076] b Turn over the box, then add the heating riser 7 to make the upper box;

[0077] c. Spray release agent into the lower box molding machine, put in graphite cold iron 8, then add green sand, turn over the box after compaction, and make the lower box;

[0078] The mud core 9 that d puts in the lower casing is a film-coated sand mud core;

[0079] e Cover the filter screen on the sprue nest 3, the runner 4 and the common side riser 5 of the lower box body.

[0080] In this e...

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Abstract

The invention discloses a casting process for producing a barrel liner of a double-screw plastic extruding machine by using high-vanadium-chromium iron and belongs to the field of steel and iron metallurgy. The casting process disclosed by the invention comprises the following steps: mixing sand; manufacturing a mold, namely performing foundry molding and box assembly to form an upper box body anda lower box body, wherein the upper box body is provided with an exothermic riser and two inner pouring gates, the lower box body is provided with a graphite chilling block, and the upper box body and the lower box body are each provided with a bypass casting passage; casting, namely casting by using high-vanadium-chromium iron liquid, wherein the iron liquid enters a chamber body of the barrel liner of the double-screw plastic extruding machine via the casting passages until the chamber body is full of the iron liquid; maintaining the temperature for 4 hours and then opening the box; reversing the box to make sand fall off, wherein a film coated sand-mud core also collapses and falls off; grinding; and refining. According to the casting process disclosed by the invention, the exothermicriser and the graphite chilling block are used for feeding of the upper and lower thick wall positions of a cast piece in a casting process; and meanwhile the high-vanadium-chromium iron is used for casting, so the quality of the liner can be improved, surface cracks are reduced, generation of hole shrinkage and loosening can be effectively prevented, and the strength, toughness, ductility and heat resistance of the cast piece can be improved as well.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgical casting technology, and more specifically relates to a casting technology for producing a twin-screw extruder cylinder liner by using high-vanadium-chromium ferrochrome. Background technique [0002] At present, the barrel bushings of twin-screw extruders in traditional casting are mostly cast with ordinary ferrochrome, and ordinary risers and traditional cold irons are generally used to supplement the hot joint area of ​​twin-screw extruder barrel bushes during the casting process. Shrinkage, poor feeding effect, serious casting defects, difficult to remove the riser, and the produced bushings have poor wear resistance and corrosion resistance. Therefore, a casting process for producing twin-screw extruder barrel bushings with high vanadium chromium ferrochrome is of great significance to the twin-screw extruder industry. [0003] After searching, the existing patent scheme ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/02B22C9/24C22C37/10C22C37/06B22C9/08B22D27/04B22D31/00
CPCB22C9/02B22C9/082B22C9/086B22C9/088B22C9/24B22D27/04B22D31/00B22D31/002C22C37/06C22C37/10
Inventor 费文鑫谷常伟
Owner 马鞍山市华威冶金机械有限公司
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